I meant to go to the Joseph Cornell but sadly it coincided with a three week bender. The Daumier the RA put on was the last thing I saw there I think and that was one of the best things I've ever seen anywhere.
Actually I saw the kiefer but found it glib.

I saw the Elton John collection of Man Ray and other photography- it was good fun, but I suspect a bit more middlebrow than what you're after. I like the smaller contained collections within the extension quite a lot, though I was doing the tourist thing with my gf so didn't really get to do my own thing.